Process for producing sintered ITO compact

Details Process for producing sintered ITO compact Process for producing sintered ITO compact

1996-11-08

1997-12-23

Derrington, James

Plastic and nonmetallic article shaping or treating: processes

Outside of mold sintering or vitrifying of shaped inorganic...

Including plural heating steps

264614, 264651, 264657, 264667, 264669, 264674, 501134, C04B 35457

Patent

active

057004196

ABSTRACT:
A sintered ITO compact having an ultra-high density of at least 7.08 g/cm.sup.3 is produced by a process wherein an aqueous slurry comprised of indium oxide, tin oxide, a binder, a dispersant and an aqueous medium is cast in a mold, and the thus-obtained cast green body is sintered. The aqueous slurry used is prepared by the steps of:
dispersing uniformly a tin oxide powder and a dispersant in an aqueous medium to give an aqueous slurry;
allowing the aqueous slurry to stand whereby coarse particles of tin oxide are sedimented;
separating by decantation an upper liquid layer of the aqueous slurry containing finely divided particles of tin oxide (preferably, the secondary particle sizes of which are not larger than 4 .mu.m) and the dispersant from a lower liquid layer containing the sedimented coarse particles; and then,
incorporating an indium oxide powder and a binder in the separated upper liquid layer containing finely divided tin oxide particles and the dispersant to give an aqueous slurry.

REFERENCES:
patent: 4624808 (1986-11-01), Lange
patent: 5160675 (1992-11-01), Iwamoto et al.
patent: 5433901 (1995-07-01), Rancoule et al.

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